Explanation

• Compounds with the same molecular formula but different arrangements of atoms are called isomers.
• Isomers can have different chemical and physical properties despite having the same number of atoms.

• Additional information:
  • Example of isomers: C₂H₆O → Ethanol (CH₃CH₂OH) and Dimethyl ether (CH₃OCH₃)
  • Isomerism is classified into structural isomers and stereoisomers.

Explanation

• The services sector is the largest contributor to Pakistan’s GDP.
• It accounting for around 58% of the total GDP.
• Agriculture contributes about 23%.
• Industry/manufacturing contributes around 20%.
  

Additional information:

• Services include finance, transport, education, health, and IT.
• Growth in services reflects urbanization and modernization of the economy.

Last verified on 19-01-2026

Explanation

O negative (O⁻) blood group is called the universal donor.

It can be transfused to any blood group (A, B, AB, or O).

O⁻ lacks A, B, and Rh antigens, preventing immune reactions in recipients.

Explanation

Explanation

• Author: Chaudhry Khaliquzzaman
• English edition published: 1961
• Urdu edition published: 1967
• Nature of book: Autobiography / Memoirs
• Topic: Pakistan Movement and political struggle

Last verified on 18-01-2026

Explanation

• Sir Mian Abdul Rashid was the first Chief Justice of Pakistan.
• From June 27, 1949, to June 29, 1954
• Birth: 29 June 1889, Lahore
• Death: 6 November 1981, Islamabad (aged 92)
• Appointed By: Muhammad Ali Jinnah on August 15, 1947
• Awards: Knight Bachelor, Star of India, Hilal-e-Pakistan

Additional information:

• Longest-serving Chief Justice: Mohammad Haleem
• Shortest-serving Chief Justice: Muhammad Shahabuddin

Last updated by NA on 27 April 2026

Explanation

• Nitrous oxide, commonly known as laughing gas.
• It is a colorless, non-flammable gas used in medicine.
• Nitrous oxide (N₂O) causes temporary laughing and relaxation.

Additional information:

• Nitrous oxide was discovered by Joseph Priestley in 1772.

Last verified on 18-01-2026

Explanation

The Taj Mahal is located in Agra, Uttar Pradesh, India

On the west side of the Yamuna River.

ADDITIONAL INFORMATION REALTED TAJ MEHAL

The Taj Mahal, "Crown of Palaces", also "the Taj"

It is a white marble mausoleum.

It is located in Agra, Uttar Pradesh, India

Explanation

• Vitamin D is essential for healthy bones.
  • Its deficiency leads to Rickets in children and Osteomalacia in adults. 
  • Sunlight is the best natural source of Vitamin D.

Additional information:

Deficiency effects:

• Bone pain
• Weak bones
• Skeletal deformities

Other Vitamin Deficiencies:

• Vitamin A: Night blindness
• Vitamin C: Scurvy
• Vitamin B7 (Biotin): Hair fall

Last verified on 17-01-2026

Explanation